CSLB C-46 Solar ContractorSafetyHard
A solar technician is inspecting a rooftop array and notices that the grounding electrode conductor (GEC) for the main service panel appears to be corroded at the connection point to the grounding electrode. What is the MOST immediate and significant safety concern associated with this condition?
- ACompromised path for fault current to safely dissipate.
- BReduced efficiency of the solar inverter.
- CElevated voltage readings at the array terminals.
- DIncreased risk of overcurrent in the solar array.
Show answer & explanationAnswer & explanation
Correct answer: A. Compromised path for fault current to safely dissipate.
A corroded grounding electrode conductor severely compromises the integrity of the grounding system. In the event of a ground fault or lightning strike, the corroded connection would impede the safe dissipation of fault current into the earth, leading to dangerous voltage buildup on equipment and potential shock hazards.
Why the other options are wrong
- B. While a compromised grounding system can indirectly affect overall system performance, the immediate and most significant concern is safety, not efficiency.
- C. Corrosion at the GEC connection is unlikely to directly cause elevated voltage readings at the array terminals unless a fault is already present and unable to clear.
- D. Corrosion in the GEC primarily affects the grounding path, not directly the overcurrent protection within the array itself.
Corroded Grounding Electrode Conductor (GEC)
Corrosion on a grounding electrode conductor (GEC) impairs its ability to provide a low-impedance path for fault currents to safely dissipate into the earth, creating a significant electrical shock and fire hazard.
- Compromises the entire grounding system.
- Prevents circuit breakers/fuses from tripping correctly during a fault.
- Increases risk of step/touch potentials during lightning or ground faults.
Memory trick: Corroded ground wire? Fault path's broken, danger's higher!